The small boy didn’t know____waiting for.
| A．whom they were | B．who were they |
| C．who they are | D．whom were they |
--- The Spring Festival is coming.
---Yeah, let’s go to the department store _____________ something for our parents as gifts.
| A．buy | B．bought | C．buying | D．to buy |
---How can I save the water?
---It’s easy. First, make sure the tap ____________ after using.
| A．turns off | B．is turned off |
| C．turns on | D．is turned on |
--- Must I return the book today? I haven’t finished it.
---It depends on how long you have ____________ it? You should return it two weeks.
| A．borrowed | B．lent | C．kept | D．bought |
That man ______be Mr Wang , because he has gone to Beijing.
| A．couldn’t | B．might not |
| C．can’t | D．mustn’t |